/Engine/Plugins/Experimental/CommonConversation/Source/CommonConversationRuntime/Public/ConversationContext.h
Registers an actor as part of the conversation, that actor doesn't need to have theUConversationParticipantComponentit won't be added though.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, BlueprintAuthorityOnly, Category=Conversation) static void MakeConversationParticipant ( const [FConversationContext](API\Plugins\CommonConversationRuntime\FConversationContext) & Context, [AActor](API\Runtime\Engine\GameFramework\AActor) * ParticipantActor, [FGameplayTag](API\Runtime\GameplayTags\FGameplayTag) ParticipantTag )